How do I know if my corporation is a resident of Canada?
If the corporation was incorporated after April 26, 1965, it is deemed to reside in Canada. If it was incorporated before April 26, 1965, residency is determined by where the board of directors meets or where the controlling shareholders reside.
Will my corporation be taxed on worldwide income or on Canadian-source income?
If your corporation is a resident of Canada, it will be taxed on its worldwide income for the whole year.